Cylinder lock



E. N. JACOBI CYLINDER LOCK Jan. 20, 1931.

. 2 Shets-Sheet 1 Filed'Oct. 23, 1925 WITNESSES 7 b M E INVENTDR ATTORNEY Jan. 20, 1931. E, N, A OB. 1789,755

CYLINDER LOCK Filed Oct. '23. 1925 2' Sheets-Sheet 2 FIG.1O

. as Q o WITNESSES T INVEN-T R ATTORNEY M. Ww W18 M Patented J... 2 1931 UNITED STATES-PATENT, OFFICE EDWARD N. JAOOBI, OF MILWAUKEE, WISCONSIN, ASSIGNOB TO BRIGGS AND STRAT- TON CORPORATION, OF MILWAUKEE, WI SCONSIN, A CORPORATION OFJDELAWABE CYLINDER LOCK Application filed October 28, 1925. Serial llo. 64,380.

This invention has for its object-to provide a cylinder lockof the slide tumbler type so constructed that the tumbler slides will be guided throughout their movements and not likely to bind notwithstanding spring pressure exerted thereon. 7

Another object of the invention is to provide the tumbler slides of a lock of this char-- acter with actuating springs bearing thereon at points between the guide surfaces and as close to the center of the tumbler slide as is feasible without interfering with the movements of the slide. i

Another object of the invention is to provide a lockv cylinder with a central cavity passing diametricall therethrough, in the walls of which are ormed the grooves constituting the tumbler guides and the spring cavities, all so arranged as to produce a cylinder suitable for die casting.

Another object of the invention is to provide a lock cylinder of the centrally. open type with a stationary bridge or key' guide across the opening to prevent deflection of the key by the action of the spring tumblers when moving the key in and out of the cylinder.

Another object of the invention is to provide a lock of this character with a guide shoulder for guiding the serrated edge of the key by engaging a guide shoulder on the key spaced from said edgeiand thus confining the key between'fthe guide for sand guide shoulder and the guide for the straight edge ofthekey.. p

-' Another object ofthe invention is to erfect the details, of construction of a 00k of this: type to-make it strong. and durable but inexpensive to manufacture.

With/the 'aboye and other objectsinview the inaentioneonsists in the cylinde r look as herein claimed .and all equivalents.

Referrin to the accon 'anfym'g dravging s, erence in icate' in which li e characters 0 re the same parts .in' different views,

Fig. 11s a; side view of a lockcylinder constructed in accordance with this'inven tion;

Fig. 2 is the front end view thereof'- Fig. 3 is the rear end view thereo against the action of springs to various de- Fig. 4 is a longitudinal sectionalview; Fig. 5 is the bottom view; Fig. 6 is a section on the plane of line 6-6 of Fig. -1-;

, Fig. 7 a. section on the plane of line 7-7 of Fig. 5; Fig. 8 a section on the line 8-8 of Fig. 1; Fig. 9 a similar view with, the tumbler slide and spring removed;

Fig. 10 is a top view of the lock cylinder; Fig. 11 a longitudinal sectional view there- .of with tumblers and springs removed;

Fig. 12 is a. bottom view showing a key bridge of a modified form, and

Fig. 13 is a transverse sectional view on the line 13-13 of Fig. 12.

In these drawings, 20 indicates a die cast lock cylinder, which is provided with tumbler slides 21 extending transversely therethrough to engage in opposite grooves 22 of the lock case in which it fits as usual, the presence ofa key 23 passing longitudinally through the lock cylinder and transversely through the tumbler slides to lift them grees so that they lie flush with the walls of the cylinder,'being required to permit the. c lmder to be turned to effect the release of t e lock.

The lock cylinder is provided with an openlng 24 extending longitudinally thereof and diametrically therethrough and having the key pass lengthwise through it. Opposite -grooves 25 in the side walls of the opening 24 form guides for thetumbler slides 21,

which have central openings. 26, through which the key passes.

' In order that the tumblerslides may bear with pressure on the serrated edge-of the key, each is provided with aspring 27 housed within the cylinder in the cylindrical recess 28 andengaged by an outwardly projecting" arm 29 on the edge of the tumbler slide. To avoidweakening the structure, the, several spring recesses 28 are arranged alternately on opposite sidesof the opening 2438.115. to

permit of die casting said recesses extend in one direction to the surface of the cylinder.

In order to position the spring 27 as closeas' possible to t e center line of thetumbler slide 1 seen in Figs. 9 and 11.

its recess 28 is made to open directly into the opening 24 and thus materially reduces the length of the guide groove 25 on this side of the tumbler, but compensation is provided for this interruption of the guide groove 25 by extending the arn'1'29 into a. guide groove 30 in the wall of the recess, thus giving the tumbler slide opposite edge bearings at both ends to prevent it from binding and also lateral hearings on both sides of both ends and at both edges to prevent lateral dispacements by the pressure of the key in passing therethrough. The spring recesses 28 open directly to the opening 24 i with parallel side walls and the springs 27 are seated on the closed ends thereof and are located as close as possible to the edge of the tum'bler slides but are prevented from frictional engagement therewith by pairs of beads 31 which project from the side walls of the recesses for a short distance, as best The cylinder is provided with a longitudinal key opening 32 as usual and with a key 'receiving slot 33 at its front end to receive the shoulders of the key, by the engagement of which the key turns the lock cylinder to cause the crank lug 34 on the rear end of the lock cylinder to operate mechanism not shown. To facilitate the entry of the key its end is pointed as usual and a. conical cavity 35 is formed in the front of the lock cylinder in a position to lead the point of the key.

At the entrance to the key opening it is guarded by wards 36 projecting inwardly and requiring the key to be of a shape to pass between them, but more particularly it is provided with a guide shoulder 37, which is continued at the rear end of the key opening. This guide shoulder receives a shoulder 38 of the key and co-operates with the bottom of the key opening 1n definitelyand accurately positioning the key during its entire movement in tlie cylinder from the moment its end is inserted in the opening 32 and its shoulder 38 engages the shoulder 37 and its straight edge engages the bottom key guiding surface. In order to guide the key and prevent it fromlbinding in the l'key slot.

by taking an angularposition therein'on being inserted, the longitudinal opening 24; of

" join with the walls of thegrooves which are one or more ofv such bridge pieces may be it will not becomeLijammed or bound. As

seen in F ig. 5, these bridgepieces 39 extend angularly across the opening 24 so' as to oflset. This is the preferred form 'inwhich said bridge pieces are made-integral'with the die'cast lockicylinder, but it is obvious that metrical opening with opposite guide grooves formed separately and set into slots formed in the cylinder, as in Figs. 12 and 13, wherein the bridge piece 39 slightly bent laterally is let into slots 40.

The operation of a cylinder lock of this typeis too well understood to require explanation, but the construction and arrangement is such that it is possible to form the lock cylinder as an integral die casting requiring no machining and still affording adequate guide surfaces for the spring-pressed tumbe ler slides that will not permit of their tilting or binding or of their lateral displacement or of spring interference therewith and providing for a guiding of the key throughout its movements preventing it from binding or from taking a false position that would interfere with the proper operation of the lock. The present construction accommodates large springs for the tumblers without materially weakening the cylinder construction.

' What I claim as new and desire to secure by Letters Patent is:

1. In a die cast lock cylinder having a diametrical opening for tumbler slides and provided with grooves in the walls of the opening, {tumbler slides fitting in said grooves, there being a recess in the wall of the opening in line with one of the grooves for each slide, arms on the tumbler slides projecting into said recesses, springs seated in diametrical opening with grooves in its walls,

tumbler slides slidably fitting in the grooves, and springs seated in the cylinder and bearing on the tumbler slides between the points of engagement of said slides with the grooves.

3. A die cast lock cylinder having a diametrical opening therethrough and provided with guide grooves in its opposite walls, tumbler slides fitting in said guide grooves, one of the guide grooves for each slide being recessed, a. coiled spring seated in said recess and extending along the edge of the slide, there being a continuation of the guide groove in the bottom of the recess, and an arm projecting from the slide acrossthe recess and into the continuation of the guide groove and engaging the end of the spring. 4. Andie cast lock cylinder having a diain its walls, tumbler slides fitting in the guide grooves, one of the guide grooves for. each tumbler slide being recessed to form a spring housing and having a continuation of the guide groove formed in its wall, an

arm projecting from the edge of the tumbler.

slide across the recess and into the continuation of the groove, a coiled spring seated in the recess and extending along the edgeot the tumbler slide and bearing on-the arm, and

opposite projections on the walls of the recess near the spring seat for spacin the spring from the edge of the tumbler sli e.

5. A die cast lock cylinder having a diametrical opening with uide grooves in its walls, tumbler slides tting in the guide grooves, one of the guide groovesfor each tumbler slide being recessed, a coiled spring seated in the recess, an arm projecting from the edge of the tumbler slide engaged by the spring, and opposite projections on the walls of the recess near the spring seat for spacing the spring from theedge of the tumbler slide.

, 6. lock cylinder having a diametrical opening with guide grooves in its walls, plate tumblers fitting in the guide grooves, there being a longitudinally extending key opening through the cylinder and key openings in the tumblers through which a key having a straight 'edge, a serrated edge and a longitudinally extending guide shoulder is adapted to pass, a guide shoulder formed in that portion of the key opening receiving the serrated edge of the key, said shoulders cooperating with the straight edge of the key and its bearing in the key opening to maintain a straight line movement of the key in the cylinder, the lock cylinder being die cast in one piece to obtain uniformity. v I

-7. A die cast lock cylinder having a diametrical opening therethrough provided with grooves in its walls, there being a key opening extending longitudinally through the cylinder for the rece tion of a key having a straight edge an a serrated edge, tumblers fitting in the grooves and provided with openings through which a key passes when inserted in the cylinder key 0 ening, and a bridge iece extending across t e diametrical opening'of the cylinder integral with the walls of the grooves and terminating close to the straight edge of the key to form a guide for the key.

8. A die cast lock cylinder having 11'. diametrical opening therethrough provided with grooves in its walls, tumblers fitting in said grooves, there being a key opening extending longitudinallythrough the lock cylinder for the reception of a key having a straight edge, a serrated edge an a shoulder, a shoulder in the key opening corresponding with the shoulder on the key to fit therewith, and a brid e piece extending across the diametrical opemng of the lockcylinder and terminatingapproximately in the line of the straight edge of the key to cooperate with said shoulders m guiding the keyin its passage through the diametrical opening.

9. A die cast lock cylinder having a diametrical opening therethrough with grooves in its walls, tumblers fitting in said grooves, there being a key opening extending longitudinally through the lock cylinder for the reception of a key having a straight edge and a serrated edge adapted to pass through open- 'diametrical opening, said ing ke openin s re istering with a longitudina ly exten ing ey opening extending through the cylinder for the reception of a key having a straight edge, a serrated edge and a shoulder, aguide shoulder formedin the portion of the ke opening receiving the serrated edge of the ey at both ends of the 'de' shoulder corresponding with the shou der for-med on the key, and said shoulders cooperating with the straight edge of the key and its bearing in the key opening to maintain a straight line movement of the key in the cylinder, the lock cylinder being die cast to obtain uniformity.

11. In a die cast lock cylinder having a longitudinal key slot and a longitudinally extending diametrical opening therethrough with tumbler rooves in its well, preformed spring presse pllate tumblers fitting in said grooves across t e opening and having 0 nings forming a keypassageway through t em throu h which asses a key havin a cam end and adapted to he inserted in said ey slot for the retractionfof the tumblers, and a bridge extending acrossthe opening of the lock cylinder and coo erating with the cam on the end of the key or guid ng the key in its passage through the tumbler openings.

In testimony whereof, I afiix my signature.

. EDWARD N. J ACOBI.

et into said slot and terminating 

